code: def test_open_filename_with_exclamation(data_dir):
      path = os.path.relpath(os.path.join(data_dir, "!test.geojson"))
      assert os.path.exists(path), "Missing test data"
      assert fiona.open(path), "Failed to open !test.geojson"
  
file_path: Fiona/tests/test_open.py
imports: import io
  import os
  import pytest
  import fiona
  from fiona.crs import CRS
  from fiona.errors import DriverError
  from fiona.model import Feature
label_desc: Use image node_id 2 for calling a global function with example usage: test_open_filename_with_exclamation(data_dir) without return types